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(11) | EP 0 508 459 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Digital transmission test system |
(57) Disclosed is a digital transmission test signal generating circuit for generating
a digital test signal applied to a digital signal transmission system having encoding
means (4), a transmission path (5), decoding means (7) and a display (9) supplied
with the output of the decoding means (7). The digital transmission test signal generating
circuit comprises generating means and timing means. The generating means generates
repeatedly specific data with a predetermined bit pattern. The timing means controls
the generating means in such a manner that the data will occur in the duration corresponding
to a predetermined area of the display (9). The specific data generated constitute
the worst-case state for the target transmission system to operate in. This provides
easy, visual checks on the system to see on a monitor if it functions normally given
the worst-case signals to work with. No specialized measuring instruments are required
for the checks. |